Integral Plastic Filter Cartridge Casing Design
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Solution Overview
Problem
Existing filter cartridges for oil mist and vapor removal are complex and costly to manufacture, with multiple components and assembly steps, which increases production time and material costs.
Innovation Solution
A simplified filter cartridge design featuring a casing with integrally formed plastic end caps and tubular members, allowing for in-house injection molding and rapid assembly using potting resin, which reduces the part count and simplifies the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multicomponent filter cartridges with separate metal cylinders and end caps are used, then structural strength and reliability are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the end caps with the tubular members into a single integral plastic component. The end cap includes an integrated support cylinder and mounting features, eliminating the need for separate metal cylinders and multiple assembly steps. This reduces the number of parts while maintaining structural integrity through the molded plastic construction.
Solution Approach 2:
The plastic end cap serves multiple functions simultaneously: it provides structural support, contains the filter media, provides mounting surfaces for the filter element, and includes integrated drainage pathways. The single component performs what previously required separate metal cylinders and end caps, simplifying the overall device.
2Manufacturing precision
If traditional filter cartridges with multiple separate components are used, then assembly precision can be controlled, but manufacturing time and production cost increase
Solution Approach 1:
By combining multiple components into a single molded end cap, the patent eliminates the need for precise alignment and assembly between separate metal cylinders and end caps. The integral molding process ensures precise positioning of all internal features including drainage pathways and mounting surfaces, while significantly reducing assembly time.
3Ease of manufacture
If plastic material is used for end caps and tubular members, then ease of manufacture and cost are improved, but structural strength may be compromised
Solution Approach 1:
The patent uses glass-filled plastic as the material for the end caps and tubular members. This composite material combines the manufacturing advantages of plastic (injection molding capability, cost, corrosion resistance) with the strength benefits of glass reinforcement. The glass filling provides structural integrity while allowing for complex geometries to be molded as single pieces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The new design reduces production costs and time by enabling easier assembly and integration of coalescing and drainage media, achieving high efficiency in oil mist and vapor removal with improved concentricity and reduced flow resistance.
Implementation Method 1
a tubular filter element is located within the casing, ends of the filter element being adhered to the first and second end caps by a potting resin
Implementation Method 2
Oil mist removal generally employs a coalescing filter
Implementation Method 3
it may incorporate oil vapour-absorbent activated carbon material
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A casing for a filter cartridge comprising first and second end caps (10, 16) and outer and inner foraminous tubular members (18, 24) fitting one within the other and extending from one end cap to the other to define therebetween a space for a tubular filter element (12, 14). In an embodiment, the outer foraminous tubular member (24) is formed integrally with the first end cap (10) andt he inner foraminous tubular member (18) is formed integrally with the second end cap (16). In another embodiment both the outer and the inner foraminous members may be formed integrally with one of the end caps. Theend caps and foraminous tubular members are of plastics material, and are e.g. mouldings in glass- filled PBT. Also provided is a filter cartridge comprising apleated or mouldedtubular coalescing layer andoptionallya cylindrical drainage layer within a casing as defined abovefor removing oil mist from a gas stream.In the alternative the filter element may comprise activated carbon which may be in the form of pleated cloth for removing oil vapour from a gas stream.